Add debug overlay for SDL renderer

app/streaming/video/ffmpeg-renderers/sdlvid.h

@@ -2,24 +2,31 @@
 
 #include "renderer.h"
 
+#include <SDL_ttf.h>
+
 class SdlRenderer : public IFFmpegRenderer {
 public:
     SdlRenderer();
-    virtual ~SdlRenderer();
+    virtual ~SdlRenderer() override;
     virtual bool initialize(SDL_Window* window,
                             int videoFormat,
                             int width,
                             int height,
                             int maxFps,
-                            bool enableVsync);
-    virtual bool prepareDecoderContext(AVCodecContext* context);
-    virtual void renderFrameAtVsync(AVFrame* frame);
-    virtual bool needsTestFrame();
-    virtual int getDecoderCapabilities();
-    virtual FramePacingConstraint getFramePacingConstraint();
+                            bool enableVsync) override;
+    virtual bool prepareDecoderContext(AVCodecContext* context) override;
+    virtual void renderFrameAtVsync(AVFrame* frame) override;
+    virtual bool needsTestFrame() override;
+    virtual int getDecoderCapabilities() override;
+    virtual FramePacingConstraint getFramePacingConstraint() override;
+    virtual void notifyOverlayUpdated(Overlay::OverlayType) override;
 
 private:
     SDL_Renderer* m_Renderer;
     SDL_Texture* m_Texture;
+    TTF_Font* m_DebugOverlayFont;
+    SDL_Surface* m_DebugOverlaySurface;
+    SDL_Texture* m_DebugOverlayTexture;
+    SDL_Rect m_DebugOverlayRect;
 };